We have a branch office operating on the 192.168.40.x network in an environment with windows xp and windows 7 machines. Whenever the windows 7 machines are powered on, they have no internet connectivity. The machine can still connect to other machines on that network, but requests to our other networks(1.x, 20.x, 30.x) and requests to the internet are denied due to the lack of connectivity. Windows XP machines aren't effected and windows 7 machines at our other locations do no experience this problem. Furthermore, if I ping each individual problem machine from a computer outside of the 40.x network, connectivity is restored to each machine that's been denied internet access. I've attempted to update drivers and I've performed windows updates. The strange thing is that just being able to ping the windows 7 machine from outside the 40.x network "fixes" the lack of connectivity. Any ideas?

Check your firewall and make sure that windows 7 is not checking internet connectivity on a closed port. It might be checking connectivity to someplaceyou have blocked and will not come online until it see outside traffic. ie ping from other subnet

Wahinkto, I was thinking that it may have to do with our firewall, but I'm not sure yet. I like your suggestion, and can certainly check for ports that need to be opened up, but how would I know which port Windows 7 is checking for connectivity on? Also, I believe we have a policy in the firewall to allow all outbound traffic, so I would think that would take care of it. I'm thinking about adding a firewall policy to open up access from the specific IP of a problem computer to the external interface of the firewall just to test, but I'm hesitant to "open the flood gates" if you will.

Finally found the cause of the problem with this one via a lot of trial and error and narrowing things down. Turns out we had a device on the network that had a bad config that was creating a black hole on our network and was causing all sorts of other problems. I reset the device to defaults, reconfigured it, and all is well. Thanks for the replies.

0

This discussion has been inactive for over a year.

You may get a better answer to your question by starting a new discussion.